I think you have the serial number wrong. Only 409,000 of these rifles were made.
With the serial number that you provided,your Winchester model 62A was made in the year 1947.
your model 62A was one of the last rifles made in 1957.
Your Model 62A was manufactured in 1953 -"Spider"
With the serial number that you have provided,your Winchester model 62A was made in the year 1953.
Your winchester model 62A was made by winchester in 1948.
No sn's required before 1968.
1958
Winchester Model 62A serial number 374812 was manufactured in February of the year 1956.
Your Winchester model 62A was produced in 1946.
your Winchester model 62a was made in 1957.
Your winchester model 62A was made by winchester in 1958.
Your Winchester model 62a was made by Winchester in 1958.